#!/bin/sh /etc/rc.common
# Copyright 2017-2022 Stan Grishin (stangri@melmac.ca)
# shellcheck disable=SC1091,SC2016,SC3043,SC3057,SC3060

# shellcheck disable=SC2034
START=94
# shellcheck disable=SC2034
USE_PROCD=1
LC_ALL=C

if type extra_command 1>/dev/null 2>&1; then
	extra_command 'allow' 'Allows domain in current block-list and config'
	extra_command 'check' 'Checks if specified domain is found in current block-list'
	extra_command 'dl' 'Force-downloads all enabled block-list'
	extra_command 'killcache' 'Delete all cached files'
	extra_command 'sizes' 'Displays the file-sizes of enabled block-lists'
	extra_command 'version' 'Show version information'
else
# shellcheck disable=SC2034
	EXTRA_COMMANDS='allow check dl killcache sizes status_service version'
# shellcheck disable=SC2034
	EXTRA_HELP='	allow	Allows domain(s) in current block-list and config
	check	Checks if specified domain is found in current block-list
	dl	Force-downloads all enabled block-list
	sizes	Displays the file-sizes of enabled block-lists'
fi

readonly PKG_VERSION='dev-test'
readonly packageName='simple-adblock'
readonly serviceName="$packageName $PKG_VERSION"
readonly packageConfigFile="/etc/config/${packageName}"
readonly dnsmasqAddnhostsFile="/var/run/${packageName}/dnsmasq.addnhosts"
readonly dnsmasqAddnhostsCache="/var/run/${packageName}/dnsmasq.addnhosts.cache"
readonly dnsmasqAddnhostsGzip="/etc/${packageName}.dnsmasq.addnhosts.gz"
readonly dnsmasqAddnhostsFilter='s|^|127.0.0.1 |;s|$||'
readonly dnsmasqAddnhostsFilterIPv6='s|^|:: |;s|$||'
readonly dnsmasqConfFile="/tmp/dnsmasq.d/${packageName}"
readonly dnsmasqConfCache="/var/run/${packageName}/dnsmasq.conf.cache"
readonly dnsmasqConfGzip="/etc/${packageName}.dnsmasq.conf.gz"
readonly dnsmasqConfFilter='s|^|local=/|;s|$|/|'
readonly dnsmasqIpsetFile="/tmp/dnsmasq.d/${packageName}.ipset"
readonly dnsmasqIpsetCache="/var/run/${packageName}/dnsmasq.ipset.cache"
readonly dnsmasqIpsetGzip="/etc/${packageName}.dnsmasq.ipset.gz"
readonly dnsmasqIpsetFilter='s|^|ipset=/|;s|$|/adb|'
readonly dnsmasqNftsetFile="/tmp/dnsmasq.d/${packageName}.nftset"
readonly dnsmasqNftsetCache="/var/run/${packageName}/dnsmasq.nftset.cache"
readonly dnsmasqNftsetGzip="/etc/${packageName}.dnsmasq.nftset.gz"
readonly dnsmasqNftsetFilter='s|^|nftset=/|;s|$|/4#inet#fw4#adb4|'
readonly dnsmasqNftsetFilterIPv6='s|^|nftset=/|;s|$|/4#inet#fw4#adb4,6#inet#fw4#adb6|'
readonly dnsmasqServersFile="/var/run/${packageName}/dnsmasq.servers"
readonly dnsmasqServersCache="/var/run/${packageName}/dnsmasq.servers.cache"
readonly dnsmasqServersGzip="/etc/${packageName}.dnsmasq.servers.gz"
readonly dnsmasqServersFilter='s|^|server=/|;s|$|/|'
readonly unboundFile="/var/lib/unbound/adb_list.${packageName}"
readonly unboundCache="/var/run/${packageName}/unbound.cache"
readonly unboundGzip="/etc/${packageName}.unbound.gz"
readonly unboundFilter='s|^|local-zone: "|;s|$|" static|'
readonly A_TMP="/var/${packageName}.hosts.a.tmp"
readonly B_TMP="/var/${packageName}.hosts.b.tmp"
readonly jsonFile="/var/run/${packageName}/${packageName}.json"
readonly sharedMemoryError="/dev/shm/$packageName-error"
readonly sharedMemoryOutput="/dev/shm/$packageName-output"
readonly hostsFilter='/localhost/d;/^#/d;/^[^0-9]/d;s/^0\.0\.0\.0.//;s/^127\.0\.0\.1.//;s/[[:space:]]*#.*$//;s/[[:cntrl:]]$//;s/[[:space:]]//g;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;/[^[:alnum:]_.-]/d;'
readonly domainsFilter='/^#/d;s/[[:space:]]*#.*$//;s/[[:space:]]*$//;s/[[:cntrl:]]$//;/[[:space:]]/d;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;/[^[:alnum:]_.-]/d;'
readonly dnsmasqAddressFilter='\|^address=/[[:alnum:]_.-].*/#|!d'
readonly _OK_='\033[0;32m\xe2\x9c\x93\033[0m'
readonly _FAIL_='\033[0;31m\xe2\x9c\x97\033[0m'
readonly __OK__='\033[0;32m[\xe2\x9c\x93]\033[0m'
readonly __FAIL__='\033[0;31m[\xe2\x9c\x97]\033[0m'
readonly _ERROR_='\033[0;31mERROR\033[0m'
readonly _WARNING_='\033[0;33mWARNING\033[0m'
# shellcheck disable=SC2155
readonly ipset="$(command -v ipset)"
# shellcheck disable=SC2155
readonly nft="$(command -v nft)"
readonly canaryDomainsMozilla='use-application-dns.net'
readonly canaryDomainsiCloud='mask.icloud.com mask-h2.icloud.com'

debug() { local i j; for i in "$@"; do eval "j=\$$i"; echo "${i}: ${j} "; done; }

uci_add_list_if_new() {
	local PACKAGE="$1"
	local CONFIG="$2"
	local OPTION="$3"
	local VALUE="$4"
	local i
	[ -n "$PACKAGE" ] && [ -n "$CONFIG" ] && [ -n "$OPTION" ] && [ -n "$VALUE" ] || return 1
	for i in $(uci_get "$PACKAGE" "$CONFIG" "$OPTION"); do
		[ "$i" = "$VALUE" ] && return 0
	done
	uci_add_list "$PACKAGE" "$CONFIG" "$OPTION" "$VALUE"
}
uci_changes() {
	local PACKAGE="$1"
	local CONFIG="$2"
	local OPTION="$3"
	/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} changes "$PACKAGE${CONFIG:+.$CONFIG}${OPTION:+.$OPTION}"
}

ipset() { "$ipset" "$@" >/dev/null 2>&1; }
nft() { "$nft" "$@" >/dev/null 2>&1; }

get_status_text() {
	local _ret
	case "$1" in
		statusNoInstall) _ret="$serviceName is not installed or not found";;
		statusStopped) _ret="Stopped";;
		statusStarting) _ret="Starting";;
		statusRestarting) _ret="Restarting";;
		statusForceReloading) _ret="Force Reloading";;
		statusDownloading) _ret="Downloading";;
		statusProcessing) _ret="Processing";;
		statusError) _ret="Error";;
		statusWarning) _ret="Warning";;
		statusFail) _ret="Fail";;
		statusSuccess) _ret="Success";;
	esac
	printf "%b" "$_ret"
}
get_error_text() {
	local _ret
	case "$1" in
		errorOutputFileCreate) _ret="failed to create $outputFile file";;
		errorFailDNSReload) _ret="failed to restart/reload DNS resolver";;
		errorSharedMemory) _ret="failed to access shared memory";;
		errorSorting) _ret="failed to sort data file";;
		errorOptimization) _ret="failed to optimize data file";;
		errorAllowListProcessing) _ret="failed to process allow-list";;
		errorDataFileFormatting) _ret="failed to format data file";;
		errorMovingDataFile) _ret="failed to move data file '${A_TMP}' to '${outputFile}'";;
		errorCreatingCompressedCache) _ret="failed to create compressed cache";;
		errorRemovingTempFiles) _ret="failed to remove temporary files";;
		errorRestoreCompressedCache) _ret="failed to unpack compressed cache";;
		errorRestoreCache) _ret="failed to move '$outputCache' to '$outputFile'";;
		errorOhSnap) _ret="failed to create block-list or restart DNS resolver";;
		errorStopping) _ret="failed to stop $serviceName";;
		errorDNSReload) _ret="failed to reload/restart DNS resolver";;
		errorDownloadingConfigUpdate) _ret="failed to download Config Update file";;
		errorDownloadingList) _ret="failed to download";;
		errorParsingConfigUpdate) _ret="failed to parse Config Update file";;
		errorParsingList) _ret="failed to parse";;
		errorNoSSLSupport) _ret="no HTTPS/SSL support on device";;
		errorCreatingDirectory) _ret="failed to create output/cache/gzip file directory";;
	esac
	printf "%b" "$_ret"
}

output_ok() { output 1 "$_OK_"; output 2 "$__OK__\\n"; }
output_okn() { output 1 "$_OK_\\n"; output 2 "$__OK__\\n"; }
output_fail() { output 1 "$_FAIL_"; output 2 "$__FAIL__\\n"; }
output_failn() { output 1 "$_FAIL_\\n"; output 2 "$__FAIL__\\n"; }
str_replace() { printf "%b" "$1" | sed -e "s/$(printf "%b" "$2")/$(printf "%b" "$3")/g"; }
str_contains() { test "$1" != "$(str_replace "$1" "$2" '')"; }
is_greater() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"; }
is_greater_or_equal() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" = "$2"; }
is_chaos_calmer() { ubus -S call system board | grep -q 'Chaos Calmer'; }
led_on(){ if [ -n "${1}" ] && [ -e "${1}/trigger" ]; then echo 'default-on' > "${1}/trigger" 2>&1; fi; }
led_off(){ if [ -n "${1}" ] &&  [ -e "${1}/trigger" ]; then echo 'none' > "${1}/trigger" 2>&1; fi; }
dnsmasq_hup() { killall -q -s HUP dnsmasq; }
dnsmasq_kill() { killall -q -s KILL dnsmasq; }
dnsmasq_restart() { /etc/init.d/dnsmasq restart >/dev/null 2>&1; }
unbound_restart() { /etc/init.d/unbound restart >/dev/null 2>&1; }
is_present() { command -v "$1" >/dev/null 2>&1; }

output() {
# Can take a single parameter (text) to be output at any verbosity
# Or target verbosity level and text to be output at specifc verbosity
	local msg memmsg logmsg
	verbosity="${verbosity:-2}"
	if [ $# -ne 1 ]; then
		if [ $((verbosity & $1)) -gt 0 ] || [ "$verbosity" = "$1" ]; then shift; else return 0; fi
	fi
	[ -t 1 ] && printf "%b" "$1"
	msg="${1//$serviceName /service }";
	if [ "$(printf "%b" "$msg" | wc -l)" -gt 0 ]; then
		[ -s "$sharedMemoryOutput" ] && memmsg="$(cat "$sharedMemoryOutput")"
		logmsg="$(printf "%b" "${memmsg}${msg}" | sed 's/\x1b\[[0-9;]*m//g')"
		logger -t "${packageName:-service} [$$]" "$(printf "%b" "$logmsg")"
		rm -f "$sharedMemoryOutput"
	else
		printf "%b" "$msg" >> "$sharedMemoryOutput"
	fi
}

load_environment() {
	local i j wan_if wan_gw
	local validation_result="$1" quiet="$2"

	if [ "$validation_result" != '0' ]; then
		output "${_ERROR_}: $packageName config validation failed!\\n"
		output "Please check if the '$packageConfigFile' contains correct values for config options.\\n"
		return 1
	fi

	if [ "$enabled" -eq 0 ]; then
		output "$packageName is currently disabled.\\n"
		output "Run the following commands before starting service again:\\n"
		output "uci set ${packageName}.config.enabled='1'; uci commit $packageName;\\n"
		return 1
	fi

	if [ "$debug" -ne 0 ]; then
		exec 1>>/tmp/simple-adblock.log
		exec 2>&1
		set -x
	fi

	if [ -n "$dnsmasq_config_file_url" ]; then
		case "$dns" in
			dnsmasq.conf) :;;
			*)
				if [ -z "$quiet" ]; then
					output "$_WARNING_: use of external dnsmasq config file detected, please set 'dns' option to 'dnsmasq.conf'!\\n"
				fi
			;;
		esac
	fi

	case "$dns" in
		dnsmasq.addnhosts|dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset|dnsmasq.servers)
			if dnsmasq -v 2>/dev/null | grep -q 'no-IDN' || ! dnsmasq -v 2>/dev/null | grep -q -w 'IDN'; then
				allow_non_ascii=0
			fi
		;;
		unbound.adb_list)
			allow_non_ascii=1;;
	esac

	case "$dns" in
		dnsmasq.ipset)
			if dnsmasq -v 2>/dev/null | grep -q 'no-ipset' || ! dnsmasq -v 2>/dev/null | grep -q -w 'ipset'; then
				if [ -z "$quiet" ]; then
					output "$_ERROR_: dnsmasq ipset support is enabled in $packageName, but dnsmasq is either not installed or installed dnsmasq does not support ipset!\\n"
				fi
				dns='dnsmasq.servers'
			fi
			if ! ipset help hash:net; then
				if [ -z "$quiet" ]; then
					output "$_ERROR_: dnsmasq ipset support is enabled in $packageName, but ipset is either not installed or installed ipset does not support 'hash:net' type!\\n"
				fi
				dns='dnsmasq.servers'
			fi
		;;
		dnsmasq.nftset)
			if dnsmasq -v 2>/dev/null | grep -q 'no-nftset' || ! dnsmasq -v 2>/dev/null | grep -q -w 'nftset'; then
				if [ -z "$quiet" ]; then
					output "$_ERROR_: dnsmasq nft sets support is enabled in $packageName, but dnsmasq is either not installed or installed dnsmasq does not support nft sets!\\n"
				fi
				dns='dnsmasq.servers'
			fi
			if [ -z "$nft" ]; then
				if [ -z "$quiet" ]; then
					output "$_ERROR_: dnsmasq nft sets support is enabled in $packageName, but nft is not installed!\\n"
				fi
				dns='dnsmasq.servers'
			fi
		;;
	esac

	case "$dns" in
		dnsmasq.addnhosts)
			outputFilter="$dnsmasqAddnhostsFilter"
			outputFile="$dnsmasqAddnhostsFile"
			outputCache="$dnsmasqAddnhostsCache"
			outputGzip="$dnsmasqAddnhostsGzip"
			if [ "$ipv6_enabled" -ne 0 ]; then
				outputFilterIPv6="$dnsmasqAddnhostsFilterIPv6"
			fi
			rm -f "$dnsmasqConfFile" "$dnsmasqConfCache" "$dnsmasqConfGzip"
			rm -f "$dnsmasqIpsetFile" "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
			rm -f "$dnsmasqNftsetFile" "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
			rm -f "$dnsmasqServersFile" "$dnsmasqServersCache" "$dnsmasqServersGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
		;;
		dnsmasq.conf)
			outputFilter="$dnsmasqConfFilter"
			outputFile="$dnsmasqConfFile"
			outputCache="$dnsmasqConfCache"
			outputGzip="$dnsmasqConfGzip"
			rm -f "$dnsmasqAddnhostsFile" "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
			rm -f "$dnsmasqIpsetFile" "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
			rm -f "$dnsmasqNftsetFile" "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
			rm -f "$dnsmasqServersFile" "$dnsmasqServersCache" "$dnsmasqServersGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
		;;
		dnsmasq.ipset)
			outputFilter="$dnsmasqIpsetFilter"
			outputFile="$dnsmasqIpsetFile"
			outputCache="$dnsmasqIpsetCache"
			outputGzip="$dnsmasqIpsetGzip"
			rm -f "$dnsmasqAddnhostsFile" "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
			rm -f "$dnsmasqConfFile" "$dnsmasqConfCache" "$dnsmasqConfGzip"
			rm -f "$dnsmasqNftsetFile" "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
			rm -f "$dnsmasqServersFile" "$dnsmasqServersCache" "$dnsmasqServersGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
		;;
		dnsmasq.nftset)
			if [ "$ipv6_enabled" -ne 0 ]; then
				outputFilter="$dnsmasqNftsetFilterIPv6"
			else
				outputFilter="$dnsmasqNftsetFilter"
			fi
			outputFile="$dnsmasqNftsetFile"
			outputCache="$dnsmasqNftsetCache"
			outputGzip="$dnsmasqNftsetGzip"
			rm -f "$dnsmasqAddnhostsFile" "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
			rm -f "$dnsmasqConfFile" "$dnsmasqConfCache" "$dnsmasqConfGzip"
			rm -f "$dnsmasqIpsetFile" "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
			rm -f "$dnsmasqServersFile" "$dnsmasqServersCache" "$dnsmasqServersGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
		;;
		dnsmasq.servers)
			outputFilter="$dnsmasqServersFilter"
			outputFile="$dnsmasqServersFile"
			outputCache="$dnsmasqServersCache"
			outputGzip="$dnsmasqServersGzip"
			rm -f "$dnsmasqAddnhostsFile" "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
			rm -f "$dnsmasqConfFile" "$dnsmasqConfCache" "$dnsmasqConfGzip"
			rm -f "$dnsmasqIpsetFile" "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
			rm -f "$dnsmasqNftsetFile" "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
		;;
		unbound.adb_list)
			outputFilter="$unboundFilter"
			outputFile="$unboundFile"
			outputCache="$unboundCache"
			outputGzip="$unboundGzip"
			rm -f "$dnsmasqAddnhostsFile" "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
			rm -f "$dnsmasqConfFile" "$dnsmasqConfCache" "$dnsmasqConfGzip"
			rm -f "$dnsmasqIpsetFile" "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
			rm -f "$dnsmasqNftsetFile" "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
			rm -f "$dnsmasqServersFile" "$dnsmasqServersCache" "$dnsmasqServersGzip"
		;;
	esac

	for i in "$outputFile" "$outputCache" "$outputGzip"; do
		if ! mkdir -p "$(dirname "$i")"; then
			output "$_ERROR_: Unable to create directory for $i!\\n"
			json add error "errorOutputFileCreate"
		fi
	done

	. /lib/functions/network.sh
	. /usr/share/libubox/jshn.sh

	is_present 'gawk' && awk='gawk'
	if ! is_present '/usr/libexec/grep-gnu' || ! is_present '/usr/libexec/sed-gnu' || \
		! is_present '/usr/libexec/sort-coreutils' || ! is_present 'gawk'; then
			local s="opkg update; opkg --force-overwrite install"
			is_present 'gawk' || s="$s gawk"
			is_present '/usr/libexec/grep-gnu' || s="$s grep"
			is_present '/usr/libexec/sed-gnu' || s="$s sed"
			is_present '/usr/libexec/sort-coreutils' || s="$s coreutils-sort"
			if [ -z "$quiet" ]; then
				output "$_WARNING_: Some recommended packages are missing, install them by running:\\n"
				output "$s;\\n"
			fi
	fi
	# Prefer curl because it supports the file:// scheme.
	if is_present 'curl'; then
		dl_command="curl --silent --insecure"
		dl_command="${dl_command}${curl_max_file_size:+ --max-filesize $curl_max_file_size}"
		dl_command="${dl_command}${curl_retry:+ --retry $curl_retry}"
		dl_command="${dl_command}${download_timeout:+ --connect-timeout $download_timeout}"
		dl_flag="-o"
	elif is_present '/usr/libexec/wget-ssl'; then
		dl_command="/usr/libexec/wget-ssl --no-check-certificate -q"
		dl_command="${dl_command}${download_timeout:+ --timeout $download_timeout}"
		dl_flag="-O"
	elif is_present wget && wget --version 2>/dev/null | grep -q "+https"; then
		dl_command="wget --no-check-certificate -q"
		dl_command="${dl_command}${download_timeout:+ --timeout $download_timeout}"
		dl_flag="-O"
	else
		dl_command="uclient-fetch --no-check-certificate -q"
		dl_command="${dl_command}${download_timeout:+ --timeout $download_timeout}"
		dl_flag="-O"
	fi
	led="${led:+/sys/class/leds/$led}"
	if curl --version 2>/dev/null | grep -q "https" \
		|| wget --version 2>/dev/null | grep -q "+https" \
		|| grep -q "libustream-mbedtls" /usr/lib/opkg/status \
		|| grep -q "libustream-openssl" /usr/lib/opkg/status \
		|| grep -q "libustream-wolfssl" /usr/lib/opkg/status; then
		isSSLSupported=1
	else
		unset isSSLSupported
	fi
	cache 'test' && return 0 
	cache 'test_gzip' && return 0
	network_flush_cache; network_find_wan wan_if; network_get_gateway wan_gw "$wan_if";
	[ -n "$wan_gw" ] && return 0
	output "$_ERROR_: $serviceName failed to discover WAN gateway.\\n"; return 1;
}

dnsmasq() {
	local cfg="$1" param="$2"
	case "$param" in
		dnsmasq.addnhosts)
			if [ "$(uci_get 'dhcp' "$cfg" 'serversfile')" = "$dnsmasqServersFile" ]; then
				uci_remove 'dhcp' "$cfg" 'serversfile'
			fi
			uci_add_list_if_new 'dhcp' "$cfg" 'addnhosts' "$dnsmasqAddnhostsFile"
		;;
		cleanup|dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset|unbound.adb_list)
			uci_remove_list 'dhcp' "$cfg" 'addnhosts' "$dnsmasqAddnhostsFile"
			if [ "$(uci_get 'dhcp' "$cfg" 'serversfile')" = "$dnsmasqServersFile" ]; then
				uci_remove 'dhcp' "$cfg" 'serversfile'
			fi
		;;
		dnsmasq.servers)
			uci_remove_list 'dhcp' "$cfg" 'addnhosts' "$dnsmasqAddnhostsFile"
			if [ "$(uci_get 'dhcp' "$cfg" 'serversfile')" != "$dnsmasqServersFile" ]; then
				uci_set 'dhcp' "$cfg" 'serversfile' "$dnsmasqServersFile"
			fi
		;;
	esac
}

dns() {
	local param output_text i
	case $1 in
		on_start)
			if [ ! -s "$outputFile" ]; then
				json set status "statusFail"
				json add error "errorOutputFileCreate"
				output "$_ERROR_: $(get_error_text 'errorOutputFileCreate')!\\n"
				return 1
			fi

			config_load 'dhcp'
			if [ "$dns_instance" = "*" ]; then
				config_foreach dnsmasq 'dnsmasq' "$dns"
			elif [ -n "$dns_instance" ]; then
				for i in $dns_instance; do
					dnsmasq "@dnsmasq[$i]" "$dns" || dnsmasq "$i" "$dns"
				done
			fi

			case "$dns" in
				dnsmasq.addnhosts|dnsmasq.servers)
					param=dnsmasq_restart
					output_text='Reloading dnsmasq'
				;;
				dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset)
					param=dnsmasq_restart
					output_text='Restarting dnsmasq'
				;;
				unbound.adb_list)
					param=unbound_restart
					output_text='Restarting Unbound'
				;;
			esac

			if [ -n "$(uci_changes dhcp)" ]; then
				uci_commit dhcp
				if [ "$param" = 'unbound_restart' ]; then
					param='dnsmasq_restart; unbound_restart;'
					output_text='Restarting Unbound/dnsmasq'
				else
					param=dnsmasq_restart
					output_text='Restarting dnsmasq'
				fi
			fi
			output 1 "$output_text "
			output 2 "$output_text "
			json set message "$output_text"
			if eval "$param"; then
				json set status "statusSuccess"
				led_on "$led"
				output_okn
			else 
				output_fail
				json set status "statusFail"
				json add error "errorDNSReload"
				output "$_ERROR_: $(get_error_text 'errorDNSReload')!\\n"
				return 1
			fi
		;;
		on_stop)
			case "$dns" in
				dnsmasq.addnhosts|dnsmasq.servers)
					param=dnsmasq_restart
				;;
				dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset)
					param=dnsmasq_restart
				;;
				unbound.adb_list)
					param=unbound_restart
				;;
			esac
			if [ -n "$(uci_changes dhcp)" ]; then 
				uci_commit dhcp
				if [ "$param" = 'unbound_restart' ]; then
					param='dnsmasq_restart; unbound_restart;'
				else
					param=dnsmasq_restart
				fi
			fi
			eval "$param"
			return $?
		;;
		quiet)
			case "$dns" in
				dnsmasq.addnhosts|dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset|dnsmasq.servers)
					param=dnsmasq_restart
				;;
				unbound.adb_list)
					param=unbound_restart
				;;
			esac
			eval "$param"
			return $?
		;;
	esac
}

json() {
# shellcheck disable=SC2034
	local action="$1" param="$2" value="$3"
	local status message error stats
	local reload restart curReload curRestart ret i
	if [ -s "$jsonFile" ]; then
		json_load_file "$jsonFile" 2>/dev/null
		json_select 'data' 2>/dev/null
		for i in status message error stats reload restart; do
			json_get_var $i "$i" 2>/dev/null
		done
	fi
	case "$action" in
		get)
			case "$param" in
				triggers)
					curReload="$parallel_downloads $debug $download_timeout $allowed_domain $blocked_domain $allowed_domains_url \
						$blocked_domains_url $blocked_hosts_url $dns $config_update_enabled $config_update_url \
						$dnsmasq_config_file_url $curl_max_file_size $curl_retry"
					curRestart="$compressed_cache $force_dns $led $force_dns_port"
					if [ ! -s "$jsonFile" ]; then
						ret='on_boot'
					elif [ "$curReload" != "$reload" ]; then
						ret='download'
					elif [ "$curRestart" != "$restart" ]; then
						ret='restart'
					fi
					printf "%b" "$ret"
					return;;
				*)
					printf "%b" "$(eval echo "\$$param")"; return;;
			esac
		;;
		add)
			if [ -n "$(eval echo "\$$param")" ]; then
				value="$(eval echo "\$$param") ${value}"
			fi
				eval "$param"='${value}'
		;;
		del)
			case "$param" in
				all)
					unset status message error stats;;
				triggers) 
					unset reload restart;;
				*)
					unset "$param";;
			esac
		;;
		set)
			case "$param" in
				triggers) 
					reload="$parallel_downloads $debug $download_timeout $allowed_domain $blocked_domain $allowed_domains_url \
						$blocked_domains_url $blocked_hosts_url $dns $config_update_enabled $config_update_url \
						$dnsmasq_config_file_url $curl_max_file_size $curl_retry"
					restart="$compressed_cache $force_dns $led $force_dns_port"
				;;
				*)
					eval "$param"='$value';;
			esac
		;;
	esac
	json_init
	json_add_object 'data'
	json_add_string version "$PKG_VERSION"
	json_add_string status "$status"
	json_add_string message "$message"
	json_add_string error "$error"
	json_add_string stats "$stats"
	json_add_string reload "$reload"
	json_add_string restart "$restart"
	json_close_object
	json_dump > "$jsonFile"
	sync
}

cache() {
	local R_TMP
	case "$1" in
		create|backup)
			[ -s "$outputFile" ] && { mv -f "$outputFile" "$outputCache"; true > "$outputFile"; } >/dev/null 2>/dev/null
			return $?
		;;
		restore|use)
			[ -s "$outputCache" ] && mv "$outputCache" "$outputFile" >/dev/null 2>/dev/null
			return $?
		;;
		test)
			[ -s "$outputCache" ]
			return $?
		;;
		test_gzip)
			[ -s "$outputGzip" ] && gzip -t -c "$outputGzip"
			return $?
		;;
		create_gzip)
			rm -f "$outputGzip" >/dev/null 2>/dev/null
			R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
			if gzip < "$outputFile" > "$R_TMP"; then
				if mv "$R_TMP" "$outputGzip"; then
					rm -f "$R_TMP"
					return 0
				else
					rm -f "$R_TMP"
					return 1
				fi
			else
				return 1
			fi
		;;
		expand|unpack|unpack_gzip)
			[ -s "$outputGzip" ] && gzip -dc < "$outputGzip" > "$outputCache"
			return $?
		;;
	esac
}

process_url() {
	local label type D_TMP R_TMP
	if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then return 1; fi
	label="${1##*//}"; label="${label%%/*}";
	case "$2" in
		dnsmasq) label="Dnsmasq: $label"; filter="$dnsmasqAddressFilter";;
		domains) label="Domains: $label"; filter="$domainsFilter";;
		hosts) label="Hosts:   $label"; filter="$hostsFilter";;
	esac
	case "$3" in
		allowed) type='Allowed'; D_TMP="$A_TMP";;
		blocked) type='Blocked'; D_TMP="$B_TMP";;
		file) type='File'; D_TMP="$B_TMP";;
	esac
	if [ "${1:0:5}" = "https" ] && [ -z "$isSSLSupported" ]; then
		output 1 "$_FAIL_"
		output 2 "[DL] $type $label $__FAIL__\\n"
		echo "errorNoSSLSupport|${1}" >> "$sharedMemoryError"
		return 0
	fi
	while [ -z "$R_TMP" ] || [ -e "$R_TMP" ]; do
		R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
	done
	if ! $dl_command "$1" $dl_flag "$R_TMP" 2>/dev/null || [ ! -s "$R_TMP" ]; then
		output 1 "$_FAIL_"
		output 2 "[DL] $type $label $__FAIL__\\n"
		echo "errorDownloadingList|${1}" >> "$sharedMemoryError"
	else
		sed -i "$filter" "$R_TMP"
		if [ ! -s "$R_TMP" ]; then
			output 1 "$_FAIL_"
			output 2 "[DL] $type $label $__FAIL__\\n"
			echo "errorParsingList|${1}" >> "$sharedMemoryError"
		else
			cat "${R_TMP}" >> "$D_TMP"
			output 1 "$_OK_"
			output 2 "[DL] $type $label $__OK__\\n"
		fi
	fi
	rm -f "$R_TMP"
	return 0
}

download_dnsmasq_file() {
	local hf allow_filter j=0 R_TMP

	json set message "$(get_status_text "statusDownloading")..."
	json set status "statusDownloading"

	rm -f "$A_TMP" "$B_TMP" "$outputFile" "$outputCache" "$outputGzip"
	if [ "$($awk '/^MemFree/ {print int($2/1000)}' "/proc/meminfo")" -lt 32 ]; then
		output 3 'Low free memory, restarting resolver '
		if dns 'quiet'; then
			output_okn
		else 
			output_failn
		fi
	fi
	touch $A_TMP; touch $B_TMP;
	output 1 'Downloading dnsmasq file '
	rm -f "$sharedMemoryError"
	process_url "$dnsmasq_config_file_url" 'dnsmasq' 'file'
#	output 1 '\n'
	if [ -s "$sharedMemoryError" ]; then
		while IFS= read -r line; do
			json add error "$line"
		done < "$sharedMemoryError"
		rm -f "$sharedMemoryError"
	fi
	output 2 'Creating dnsmasq file '
	if mv "$B_TMP" "$outputFile"; then
		output 2 "$__OK__\\n"
	else
		output 2 "$__FAIL__\\n"
		json add error "errorMovingDataFile"
	fi
	output 1 '\n'
}

download_lists() {
	local hf allow_filter j=0 R_TMP

	json set message "$(get_status_text "statusDownloading")..."
	json set status "statusDownloading"

	rm -f "$A_TMP" "$B_TMP" "$outputFile" "$outputCache" "$outputGzip"
	if [ "$($awk '/^MemFree/ {print int($2/1000)}' "/proc/meminfo")" -lt 32 ]; then
		output 3 'Low free memory, restarting resolver '
		if dns 'quiet'; then
			output_okn
		else 
			output_failn
		fi
	fi
	touch $A_TMP; touch $B_TMP;
	output 1 'Downloading lists '
	rm -f "$sharedMemoryError"
	for hf in ${blocked_hosts_url}; do
		if [ "$parallel_downloads" -gt 0 ]; then
			process_url "$hf" 'hosts' 'blocked' &
		else
			process_url "$hf" 'hosts' 'blocked'
		fi
	done
	for hf in ${blocked_domains_url}; do
		if [ "$parallel_downloads" -gt 0 ]; then
			process_url "$hf" 'domains' 'blocked' &
		else
			process_url "$hf" 'domains' 'blocked'
		fi
	done
	for hf in ${allowed_domains_url}; do
		if [ "$parallel_downloads" -gt 0 ]; then
			process_url "$hf" 'domains' 'allowed' &
		else
			process_url "$hf" 'domains' 'allowed'
		fi
	done
	wait
	output 1 '\n'
	if [ -s "$sharedMemoryError" ]; then
		while IFS= read -r line; do
			json add error "$line"
		done < "$sharedMemoryError"
		rm -f "$sharedMemoryError"
	fi

	if [ "$canary_domains_icloud" -ne 0 ]; then
		canaryDomains="${canaryDomains:+$canaryDomains }${canaryDomainsiCloud}"
	fi
	if [ "$canary_domains_mozilla" -ne 0 ]; then
		canaryDomains="${canaryDomains:+$canaryDomains }${canaryDomainsMozilla}"
	fi

	for hf in $blocked_domain $canaryDomains; do echo "$hf" | sed "$domainsFilter" >> $B_TMP; done
	allowed_domain="${allowed_domain}
$(cat $A_TMP)"
	for hf in ${allowed_domain}; do hf="$(echo "$hf" | sed 's/\./\\./g')"; allow_filter="$allow_filter/^(.*\.)?${hf}$/d;"; done

	[ ! -s "$B_TMP" ] && return 1

	output 1 'Processing downloads '
	output 2 'Sorting combined list '
	json set message "$(get_status_text "statusProcessing"): sorting combined list"
	if [ "$allow_non_ascii" -gt 0 ]; then
		if sort -u "$B_TMP" > "$A_TMP"; then
			output_ok
		else
			output_failn
			json add error "errorSorting"
		fi
	else
		if sort -u "$B_TMP" | grep -E -v '[^a-zA-Z0-9=/.-]' > "$A_TMP"; then
			output_ok
		else
			output_failn
			json add error "errorSorting"
		fi
	fi

	if [ "$dns" = 'dnsmasq.conf' ] || \
		 [ "$dns" = 'dnsmasq.ipset' ] || \
		 [ "$dns" = 'dnsmasq.nftset' ] || \
		 [ "$dns" = 'dnsmasq.servers' ] || \
		 [ "$dns" = 'unbound.adb_list' ]; then
		# TLD optimization written by Dirk Brenken (dev@brenken.org)
		output 2 'Optimizing combined list '
		json set message "$(get_status_text "statusProcessing"): optimizing combined list"
# 	sed -E 'G;:t;s/(.*)(\.)(.*)(\n)(.*)/\1\4\5\2\3/;tt;s/(.*)\n(\.)(.*)/\3\2\1/' is actually slower than command below
		if $awk -F "." '{for(f=NF;f>1;f--)printf "%s.",$f;print $1}' "$A_TMP" > "$B_TMP"; then
			if sort "$B_TMP" > "$A_TMP"; then
				if $awk '{if(NR=1){tld=$NF};while(getline){if($NF!~tld"\\."){print tld;tld=$NF}}print tld}' "$A_TMP" > "$B_TMP"; then
					if $awk -F "." '{for(f=NF;f>1;f--)printf "%s.",$f;print $1}' "$B_TMP" > "$A_TMP"; then
						if sort -u "$A_TMP" > "$B_TMP"; then
							output_ok
						else
							output_failn
							json add error "errorOptimization"
							mv "$A_TMP" "$B_TMP"
						fi
					else
						output_failn
						json add error "errorOptimization"
					fi
				else
					output_failn
					json add error "errorOptimization"
					mv "$A_TMP" "$B_TMP"
				fi
			else
				output_failn
				json add error "errorOptimization"
			fi
		else
			output_failn
			json add error "errorOptimization"
			mv "$A_TMP" "$B_TMP"
		fi
	else
		mv "$A_TMP" "$B_TMP"
	fi

	output 2 'Allowing domains '
	json set message "$(get_status_text "statusProcessing"): allowing domains"
	if sed -i -E "$allow_filter" "$B_TMP"; then
		output_ok
	else
		output_failn
		json add error "errorAllowListProcessing"
	fi

	output 2 'Formatting merged file '
	json set message "$(get_status_text "statusProcessing"): formatting merged file"
	if [ -z "$outputFilterIPv6" ]; then
		if sed "$outputFilter" "$B_TMP" > "$A_TMP"; then
			output_ok
		else
			output_failn
			json add error "errorDataFileFormatting"
		fi
	else
		case "$dns" in
			dnsmasq.addnhosts)
				if sed "$outputFilter" "$B_TMP" > "$A_TMP" && \
					sed "$outputFilterIPv6" "$B_TMP" >> "$A_TMP"; then
					output_ok
				else
					output_failn
					json add error "errorDataFileFormatting"
				fi
			;;
		esac
	fi

	case "$dns" in
		dnsmasq.addnhosts)
			output 2 'Creating dnsmasq addnhosts file '
			json set message "$(get_status_text "statusProcessing"): creating dnsmasq addnhosts file"
		;;
		dnsmasq.conf)
			output 2 'Creating dnsmasq config file '
			json set message "$(get_status_text "statusProcessing"): creating dnsmasq config file"
		;;
		dnsmasq.ipset)
			output 2 'Creating dnsmasq ipset file '
			json set message "$(get_status_text "statusProcessing"): creating dnsmasq ipset file"
		;;
		dnsmasq.nftset)
			output 2 'Creating dnsmasq nft set file '
			json set message "$(get_status_text "statusProcessing"): creating dnsmasq nft set file"
		;;
		dnsmasq.servers)
			output 2 'Creating dnsmasq servers file '
			json set message "$(get_status_text "statusProcessing"): creating dnsmasq servers file"
		;;
		unbound.adb_list)
			output 2 'Creating Unbound adb_list file '
			json set message "$(get_status_text "statusProcessing"): creating Unbound adb_list file"
		;;
	esac

	if mv "$A_TMP" "$outputFile"; then
		output_ok
	else
		output_failn
		json add error "errorMovingDataFile"
	fi
	if [ "$compressed_cache" -gt 0 ]; then
		output 2 'Creating compressed cache '
		json set message "$(get_status_text "statusProcessing"): creating compressed cache"
		if cache 'create_gzip'; then
			output_ok
		else
			output_failn
			json add error "errorCreatingCompressedCache"
		fi
	else
		rm -f "$outputGzip"
	fi
	output 2 'Removing temporary files '
	json set message "$(get_status_text "statusProcessing"): removing temporary files"
	rm -f "/tmp/${packageName}_tmp.*" "$A_TMP" "$B_TMP" "$outputCache" || j=1
	if [ $j -eq 0 ]; then
		output_ok
	else
		output_failn
		json add error "errorRemovingTempFiles"
	fi
	output 1 '\n'
}

adb_allow() {
	local c hf string="$1"
	local validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1
	if [ ! -s "$outputFile" ]; then
		output "No block-list ('$outputFile') found.\\n"
		return 0
	elif [ -z "$string" ]; then
		output "Usage: /etc/init.d/${packageName} allow 'domain' ...\\n"
		return 0
	elif [ -n "$dnsmasq_config_file_url" ]; then
		output "Allowing individual domains is not possible when using external dnsmasq config file.\\n"
		return 0
	fi
	case "$dns" in
		dnsmasq.addnhosts|dnsmasq.conf|dnsmasq.ipset|dnsmasq.nftset|dnsmasq.servers)
			output 1 "Allowing domain(s) and restarting dnsmasq "
			output 2 "Allowing domain(s) \\n"
			for c in $string; do
				output 2 "  $c "
				hf="$(echo "$c" | sed 's/\./\\./g')"
				if sed -i "/^${hf}$/d;/\.${hf}$/d;" "$outputFile" && \
					uci_add_list_if_new "${packageName}" 'config' 'allowed_domain' "$c"; then
						output_ok
				else
					output_fail
				fi
			done
			if [ "$compressed_cache" -gt 0 ]; then
				output 2 'Creating compressed cache '
				if cache 'create_gzip'; then
					output_ok
				else
					output_failn
				fi
			fi
			output 2 "Committing changes to config "
			if [ -n "$(uci_changes "$packageName")" ] && uci_commit "$packageName"; then
				allowed_domain="$(uci_get "$packageName" 'config' 'allowed_domain')"
				json set triggers
				json set stats "$serviceName is blocking $(wc -l < "$outputFile") domains (with ${dns})"
				output_ok; 
				if [ "$dns" = 'dnsmasq.ipset' ]; then
					output 2 "Flushing adb ipset "
					if ipset -q -! flush adb; then output_ok; else output_fail; fi
				fi
				if [ "$dns" = 'dnsmasq.nftset' ]; then
					output 2 "Flushing adb nft sets "
					nft flush set inet fw4 adb6
					if nft flush set inet fw4 adb4; then output_ok; else output_fail; fi
				fi
				output 2 "Restarting dnsmasq "
				if dnsmasq_restart; then output_okn; else output_failn; fi
			else 
				output_fail; 
			fi
		;;
		unbound.adb_list)
			output 1 "Allowing domain(s) and restarting Unbound "
			output 2 "Allowing domain(s) \\n"
			for c in $string; do 
				output 2 "  $c "
				if sed -i "/${string}/d" "$outputFile" && \
					uci_add_list_if_new "$packageName" 'config' 'allowed_domain' "$string"; then
						output_ok
				else
					output_fail
				fi
			done
			if [ "$compressed_cache" -gt 0 ]; then
				output 2 'Creating compressed cache '
				if cache 'create_gzip'; then
					output_ok
				else
					output_failn
				fi
			fi
			output 2 "Committing changes to config "
			if [ -n "$(uci_changes "$packageName")" ] && uci_commit "$packageName"; then
				allowed_domain="$(uci_get "$packageName" 'config' 'allowed_domain')"
				json set triggers
				json set stats "$serviceName is blocking $(wc -l < "$outputFile") domains (with ${dns})"
				output_ok; 
				output 2 "Restarting Unbound "
				if unbound_restart; then output_okn; else output_failn; fi
			else 
				output_fail; 
			fi
		;;
	esac
}

adb_check() {
	local c param="$1"
	local validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1
	if [ ! -s "$outputFile" ]; then
		output "No block-list ('$outputFile') found.\\n"
		return 0
	elif [ -z "$param" ]; then
		output "Usage: /etc/init.d/${packageName} check 'domain' ...\\n"
		return 0
	fi
	for string in ${param}; do
		c="$(grep -c "$string" "$outputFile")"
		if [ "$c" -gt 0 ]; then
			if [ "$c" -eq 1 ]; then
				output "Found 1 match for '$string' in '$outputFile'.\\n"
			else
				output "Found $c matches for '$string' in '$outputFile'.\\n"
			fi
			if [ "$c" -le 20 ]; then
				case "$dns" in
					dnsmasq.addnhosts)
						grep "$string" "$outputFile" | sed 's|^127.0.0.1 ||;s|^:: ||;';;
					dnsmasq.conf)
						grep "$string" "$outputFile" | sed 's|local=/||;s|/$||;';;
					dnsmasq.ipset)
						grep "$string" "$outputFile" | sed 's|ipset=/||;s|/adb$||;';;
					dnsmasq.nftset)
						grep "$string" "$outputFile" | sed 's|nftset=/||;s|/4#inet#adb#adb4||;';;
					dnsmasq.servers)
						grep "$string" "$outputFile" | sed 's|server=/||;s|/$||;';;
					unbound.adb_list)
						grep "$string" "$outputFile" | sed 's|^local-zone: "||;s|" static$||;';;
				esac
			fi
		else
			output "The '$string' is not found in current block-list ('$outputFile').\\n"
		fi
	done
}

adb_config_update() {
	local R_TMP label
	local param="$1" validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1
	label="${config_update_url##*//}"
	label="${label%%/*}";
	[ "$config_update_enabled" -ne 0 ] || return 0

	if [ "$param" != 'download' ]; then
		cache 'test' && return 0 
		cache 'test_gzip' && return 0 
	fi
	output 1 'Updating config '
	while [ -z "$R_TMP" ] || [ -e "$R_TMP" ]; do
		R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
	done
	if ! $dl_command "$config_update_url" $dl_flag "$R_TMP" 2>/dev/null || [ ! -s "$R_TMP" ]; then
		output 1 "$_FAIL_\\n"
		output 2 "[DL] Config  Update:  $label $__FAIL__\\n"
		json add error "errorDownloadingConfigUpdate"
	else
		if [ -s "$R_TMP" ] && sed -f "$R_TMP" -i "$packageConfigFile" 2>/dev/null; then
			output 1 "$_OK_\\n"
			output 2 "[DL] Config  Update:  $label $__OK__\\n"
		else
			output 1 "$_FAIL_\\n"
			output 2 "[DL] Config  Update:  $label $__FAIL__\\n"
			json add error "errorParsingConfigUpdate"
		fi
	fi
	rm -f "$R_TMP"
	return 0
}

adb_sizes() {
	local i
	local validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1

	echo "# $(date)"
	for i in $blocked_domains_url; do
		[ "${i//melmac}" != "$i" ] && continue
		if $dl_command "$i" $dl_flag /tmp/sast 2>/dev/null && [ -s /tmp/sast ]; then
			echo "# File size: $(du -sh /tmp/sast | $awk '{print $1}')"
			if is_greater "$(du -sk /tmp/sast)" "500"; then
				echo "# block-list too big for most routers"
			elif is_greater "$(du -sk /tmp/sast)" "100"; then
				echo "# block-list may be too big for some routers"
			fi
			rm -rf /tmp/sast
			echo "  list blocked_domains_url '$i'"
			echo ""
		else
			echo "# site was down on last check"
			echo "#  list blocked_domains_url '$i'"
			echo ""
		fi
	done
	for i in $blocked_hosts_url; do
		if $dl_command "$i" $dl_flag /tmp/sast 2>/dev/null && [ -s /tmp/sast ]; then
			echo "# File size: $(du -sh /tmp/sast | $awk '{print $1}')"
			if is_greater "$(du -sk /tmp/sast)" "500"; then
				echo "# block-list too big for most routers"
			elif is_greater "$(du -sk /tmp/sast)" "100"; then
				echo "# block-list may be too big for some routers"
			fi
			rm -rf /tmp/sast
			echo "  list blocked_hosts_url '$i'"
			echo ""
		else
			echo "# site was down on last check"
			echo "#  list blocked_hosts_url '$i'"
			echo ""
		fi
	done
}

adb_start() {
	local action status error message stats c
	local validation_result="$3"

	load_environment "$validation_result" || return 1

	status="$(json get status)"
	error="$(json get error)"
	message="$(json get message)"
	stats="$(json get stats)"
	action="$(json get triggers)"

	if [ "$action" = 'on_boot' ] || [ "$1" = 'on_boot' ]; then
		if cache 'test_gzip' || cache 'test'; then
			action='restore'
		else
			action='download'
		fi
	elif [ "$action" = 'download' ] || [ "$1" = 'download' ] || [ -n "$error" ]; then
		action='download'
	elif [ ! -s "$outputFile" ]; then 
		if cache 'test_gzip' || cache 'test'; then
			action='restore'
		else
			action='download'
		fi
	elif [ "$action" = 'restart' ] || [ "$1" = 'restart' ]; then
		action='restart'
	elif [ -s "$outputFile" ] && [ "$status" = "statusSuccess" ] && [ -z "$error" ]; then
		status_service
		return 0
	else
		action='download'
	fi

	json del all
	json set triggers

	if [ "$action" = 'restore' ]; then
		output 0 "Starting $serviceName... "
		output 3 "Starting $serviceName...\\n"
		json set status "statusStarting"
		if cache 'test_gzip' && ! cache 'test' && [ ! -s "$outputFile" ]; then
			output 3 'Found compressed cache file, unpacking it '
			json set message 'found compressed cache file, unpacking it.'
			if cache 'unpack_gzip'; then
				output_okn
			else
				output_failn
				json add error "errorRestoreCompressedCache"
				output "$_ERROR_: $(get_error_text 'errorRestoreCompressedCache')!\\n"
				action='download'
			fi
		fi
		if cache 'test' && [ ! -s "$outputFile" ]; then
			output 3 'Found cache file, reusing it '
			json set message 'found cache file, reusing it.'
			if cache 'restore'; then 
				output_okn
				dns 'on_start'
			else
				output_failn
				json add error "errorRestoreCache"
				output "$_ERROR_: $(get_error_text 'errorRestoreCache')!\\n"
				action='download'
			fi
		fi
	fi
	if [ "$action" = 'download' ]; then
		if [ -s "$outputFile" ] || cache 'test' || cache 'test_gzip'; then
			output 0 "Force-reloading $serviceName... "
			output 3 "Force-reloading $serviceName...\\n"
			json set status "statusForceReloading"
		else
			output 0 "Starting $serviceName... "
			output 3 "Starting $serviceName...\\n"
			json set status "statusStarting"
		fi
		if [ -n "$dnsmasq_config_file_url" ]; then
			download_dnsmasq_file
		else
			download_lists
		fi
		dns 'on_start'
	fi
	if [ "$action" = 'restart' ]; then
		output 0 "Restarting $serviceName... "
		output 3 "Restarting $serviceName...\\n"
		json set status "statusRestarting"
		dns 'on_start'
	fi
	if [ "$action" = 'start' ]; then
		output 0 "Starting $serviceName... "
		output 3 "Starting $serviceName...\\n"
		json set status "statusStarting"
		dns 'on_start'
	fi
	if [ -s "$outputFile" ] && [ "$(json get status)" != "statusFail" ]; then
		output 0 "$__OK__\\n";
		json del message
		json set status "statusSuccess"
		json set stats "$serviceName is blocking $(wc -l < "$outputFile") domains (with ${dns})"
		status_service
	else
		output 0 "$__FAIL__\\n";
		json set status "statusFail"
		json add error "errorOhSnap"
		status_service
	fi

	procd_open_instance 'main'
	procd_set_param command /bin/true
	procd_set_param stdout 1
	procd_set_param stderr 1
	procd_open_data
	json_add_string 'status' "$(json get status)"
	json_add_string 'errors' "$(json get errors)"
	json_add_int 'entries' "$(wc -l < "$outputFile")"
	json_add_array firewall
	if [ "$force_dns" -ne 0 ]; then
		for c in $force_dns_port; do
			if netstat -tuln | grep LISTEN | grep ":${c}" >/dev/null 2>&1; then
				json_add_object ""
				json_add_string type redirect
				json_add_string target DNAT
				json_add_string src lan
				json_add_string proto "tcp udp"
				json_add_string src_dport "$c"
				json_add_string dest_port "$c"
				json_add_boolean reflection 0
				json_close_object
			else
				json_add_object ""
				json_add_string type rule
				json_add_string src lan
				json_add_string dest "*"
				json_add_string proto "tcp udp"
				json_add_string dest_port "$c"
				json_add_string target REJECT
				json_close_object
			fi
		done
	fi
	case "$dns" in
		dnsmasq.ipset)
			json_add_object ""
			json_add_string type ipset
			json_add_string name adb
			json_add_string match dest_net
			json_add_string storage hash
			json_close_object
			json_add_object ""
			json_add_string type rule
			json_add_string ipset adb
			json_add_string src lan
			json_add_string dest "*"
			json_add_string proto "tcp udp"
			json_add_string target REJECT
			json_close_object
		;;
		dnsmasq.nftset)
			json_add_object ""
			json_add_string type ipset
			json_add_string name adb4
			json_add_string family 4
			json_add_string match dest_net
			json_close_object
			json_add_object ""
			json_add_string type rule
			json_add_string ipset adb4
			json_add_string src lan
			json_add_string dest "*"
			json_add_string proto "tcp udp"
			json_add_string target REJECT
			json_close_object
			if [ "$ipv6_enabled" -ne 0 ]; then
				json_add_object ""
				json_add_string type ipset
				json_add_string name adb6
				json_add_string family 6
				json_add_string match dest_net
				json_close_object
				json_add_object ""
				json_add_string type rule
				json_add_string ipset adb6
				json_add_string src lan
				json_add_string dest "*"
				json_add_string proto "tcp udp"
				json_add_string target REJECT
				json_close_object
			fi
		;;
	esac
	json_close_array
	procd_close_data
	procd_close_instance
}

adb_status() {
	local c url status message error stats
	local validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1
	status="$(json get status)"
	message="$(json get message)"
	error="$(json get error)"
	stats="$(json get stats)"
	if [ "$status" = "statusSuccess" ]; then
		output "$stats "; output_okn;
	else
		[ -n "$status" ] && status="$(get_status_text "$status")"
		if [ -n "$status" ] && [ -n "$message" ]; then 
			status="${status}: $message"
		fi
		[ -n "$status" ] && output "$serviceName $status\\n"
	fi
	if [ -n "$error" ]; then
		for c in $error; do
			url="${c##*|}"
			c="${c%|*}"
			case "$c" in
				errorDownloadingList|errorParsingList)
					output "$_ERROR_: $(get_error_text "$c") $url!\\n";;
				*)
					output "$_ERROR_: $(get_error_text "$c")!\\n";;
			esac
			n=$((n+1))
		done
	fi
}

adb_stop() {
	local validation_result="$3"
	load_environment "$validation_result" 'quiet' || return 1
	if [ -s "$outputFile" ]; then
		output "Stopping $serviceName... "
		cache 'create'
		if dns 'on_stop'; then
			ipset -q -! flush adb
			ipset -q -! destroy adb
			nft delete set inet fw4 adb4
			nft delete set inet fw4 adb6
			led_off "$led"
			output 0 "$__OK__\\n"; output_okn;
			json set status "statusStopped"
			json del message
		else 
			output 0 "$__FAIL__\\n"; output_fail;
			json set status "statusFail"
			json add error "errorStopping"
			output "$_ERROR_: $(get_error_text 'errorStopping')!\\n"
		fi
	fi
}

service_started() { procd_set_config_changed firewall; }
service_stopped() { procd_set_config_changed firewall; }
restart_service() { rc_procd start_service 'restart'; }
reload_service() { rc_procd start_service 'restart'; }
start_service() { 
	load_validate_config 'config' adb_config_update "'$*'"
	load_validate_config 'config' adb_start "'$*'"
}
stop_service() { load_validate_config 'config' adb_stop "'$*'"; }
status_service() { load_validate_config 'config' adb_status "''"; }
service_triggers() {
	local wan wan6 i
	local procd_trigger_wan6
	config_load "$packageName"
	config_get_bool procd_trigger_wan6 'config' 'procd_trigger_wan6' '0'
	. /lib/functions/network.sh
	network_flush_cache
	network_find_wan wan
	wan="${wan:-wan}"
	if [ "$procd_trigger_wan6" -ne 0 ]; then
		network_find_wan6 wan6
		wan6="${wan6:-wan6}"
	fi
	for i in "$wan" "$wan6"; do
		[ -n "$i" ] && procd_add_interface_trigger "interface.*" "$i" "/etc/init.d/${packageName}" start
	done
	procd_add_config_trigger "config.change" "$packageName" "/etc/init.d/${packageName}" reload
}
allow() { load_validate_config 'config' adb_allow "'$*'"; }
check() { load_validate_config 'config' adb_check "'$*'"; }
dl() { rc_procd start_service 'download'; }
killcache() {
	rm -f "$dnsmasqAddnhostsCache" "$dnsmasqAddnhostsGzip"
	rm -f "$dnsmasqConfCache" "$dnsmasqConfGzip"
	rm -f "$dnsmasqIpsetCache" "$dnsmasqIpsetGzip"
	rm -f "$dnsmasqNftsetCache" "$dnsmasqNftsetGzip"
	rm -f "$dnsmasqServersCache" "$dnsmasqServersGzip"
	rm -f "$unboundCache" "$unboundGzip"
	config_load 'dhcp'
	config_foreach dnsmasq 'dnsmasq' 'cleanup'
	uci_commit 'dhcp'
	return 0
}
sizes() { load_validate_config 'config' adb_sizes "''"; }
version() { echo "$PKG_VERSION"; }

load_validate_config() {
	local dl_command
	local dl_flag
	local isSSLSupported
	local outputFilter
	local outputFilterIPv6
	local outputFile
	local outputGzip
	local outputCache
	local awk='awk'
	local enabled
	local force_dns
	local force_dns_port
	local parallel_downloads
	local debug
	local compressed_cache
	local ipv6_enabled
	local allow_non_ascii
	local canary_domains_icloud
	local canary_domains_mozilla
	local config_update_enabled
	local config_update_url
	local boot_delay
	local download_timeout
	local curl_max_file_size
	local curl_retry
	local verbosity
	local led
	local dns
	local dns_instance
	local allowed_domain
	local allowed_domains_url
	local blocked_domain
	local blocked_domains_url
	local blocked_hosts_url
	local dnsmasq_config_file_url
	uci_load_validate "$packageName" "$packageName" "$1" "${2}${3:+ $3}" \
		'enabled:bool:0' \
		'force_dns:bool:1' \
		'force_dns_port:list(integer):53 853' \
		'parallel_downloads:bool:1' \
		'debug:bool:0' \
		'compressed_cache:bool:0' \
		'ipv6_enabled:bool:0' \
		'allow_non_ascii:bool:0' \
		'canary_domains_icloud:bool:0' \
		'canary_domains_mozilla:bool:0' \
		'config_update_enabled:bool:0' \
		'config_update_url:string:https://cdn.jsdelivr.net/gh/openwrt/packages/net/simple-adblock/files/simple-adblock.conf.update' \
		'download_timeout:range(1,60):20' \
		'curl_max_file_size:uinteger' \
		'curl_retry:range(0,30):3' \
		'verbosity:range(0,2):2' \
		'procd_trigger_wan6:bool:0' \
		'led:or("", "none", file, device, string)' \
		'dns:or("dnsmasq.addnhosts", "dnsmasq.conf", "dnsmasq.ipset", "dnsmasq.servers", "unbound.adb_list"):dnsmasq.servers' \
		'dns_instance:or(list(integer, string)):0' \
		'allowed_domain:list(string)' \
		'allowed_domains_url:list(string)' \
		'blocked_domain:list(string)' \
		'blocked_domains_url:list(string)' \
		'blocked_hosts_url:list(string)' \
		'dnsmasq_config_file_url:string'
}
